<template>
    <el-menu default-active="1-4-1" class="el-menu-vertical-demo" @open="handleOpen" @close="handleClose" :collapse="isCollapse"  background-color="#545c64"
      text-color="#fff"
      active-text-color="#ffd04b">
      <h3>{{ isCollapse ? '后台' :'通用后台管理系统'}}</h3>
        <el-menu-item @click="clickMenu(item)" v-for="item in noChildren" :key="item.name" :index="item.name">
    <i :class="`el-icon-${item.icon}`"></i>
    <span slot="title">{{item.label}}</span>
  </el-menu-item>
        <el-submenu  v-for="item in hasChildren" :key="item.label" :index="item.label">
    <template slot="title">
      <i :class="`el-icon-${item.icon}`"></i>
      <span slot="title">{{ item.label }}</span>
    </template>
    <el-menu-item-group  v-for="subItem in item.children" :key="subItem.path">  
      <el-menu-item @click="clickMenu(subItem)" :index="subItem.path">{{ subItem.label }}</el-menu-item>
    </el-menu-item-group>
  </el-submenu>
</el-menu>
</template>
<style lang="less" scoped>
  .el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 400px;
  }
  .el-menu{
    height: 100vh;
    h3{
      text-align: center;
      color: #fff;
      line-height: 48px;
      font-size: 16px;
      font-weight: 400;
    }
  }
</style>

<script>
import Cookie from "js-cookie";
  export default {
    data() {
      return {}
    },
    methods: {
      handleOpen(key, keyPath) {
        console.log(key, keyPath);
      },
      handleClose(key, keyPath) {
        console.log(key, keyPath);
      },
      //点击菜单
      clickMenu(item){
        //当页面的路由和跳转路由不一致时才允许跳转
        if(this.$route.path!=item.path &&!(this.$route.path==='/home'&&(item.path==='/'))){
          this.$router.push(item.path)
        }
        this.$store.commit('selectMenu',item)
      }
    },
    computed:{
        //没有子菜单
        noChildren(){
           return this.menuData.filter(item=>!item.children)
        },
        //有子菜单
        hasChildren(){
            return this.menuData.filter(item=>item.children)
        },
        isCollapse(){
              return this.$store.state.tab.isCollapse
        },
        menuData(){
          //判断当前数据如果缓存中没有，就从当前store获取
          return JSON.parse(Cookie.get('menu')) ||this.$store.state.tab.menu
        }
    }
  }
</script>
<style lang="less" scoped>
.el-menu{
  border-right: none;
}
</style>